Annual report of the Fruit Growers' Association of Ontario, 1898 . ing wheel, or attempt,to run our machine without a balance wheel ? Thereare, doubtless, instances where introduced species cannot be subdued in this manner, by the importation oftheir ancient enemies, but, generally speaking, thisappears to be the rational method of accomplishing thisend. The history of the introduction of the Orange Scale,leery a Purchasi (Fig. 5), from Australia into California,is probably familiar to most, if not all, of those orange industry of the United States and, as wasafterwards learned, of
Annual report of the Fruit Growers' Association of Ontario, 1898 . ing wheel, or attempt,to run our machine without a balance wheel ? Thereare, doubtless, instances where introduced species cannot be subdued in this manner, by the importation oftheir ancient enemies, but, generally speaking, thisappears to be the rational method of accomplishing thisend. The history of the introduction of the Orange Scale,leery a Purchasi (Fig. 5), from Australia into California,is probably familiar to most, if not all, of those orange industry of the United States and, as wasafterwards learned, of other countries also, was threatenedwith a most destructive enemy to citrus fruits. In Cali-fornia orange groves were being destroyed to such anextent that it looked as though the cultivation of thisfruit would have to be abandoned. But a natural enemy of this pest was discovered inAustralia and imported, artificially, into this country, and as a result the pest has beensubdued, and with us, before it had spread beyond the Pacific coast. Not only this, but3 Fig. 5. 34 ENTOMOLOGICAL SOCIETY. this natural enemy, one of the Ooccinellidse, has been sent wherever the Orange Scale hasbeen introduced and the effect has been the same as in this country. All of this has beenan object lesson in the application of Natures forces in overcoming the evil results of mansinfluences in the artificial diffusion of destructive insects. In North America, and also inAustralasia, men are at present wrestling with another important pest, allied to theOrange Scale, and introduced into Oalifornia many years ago, but in this case probablyfrom Japan. I refer again to the San Jose* Scale, Aspidiotus perniciosus, which has, withus, spread over a vast range of country and already caused great losses. From all thatI have been able to learn by observation of this pest, both in the orchards of the UnitedStates and on nursery stock immediately on its arrival from Japan, and also from thewritings of others
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